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中文摘要：
通过偶联、硝化、还原等有机化学合成方法制备了3种具有异硫氰酸酯（NCS）结构的双环液晶单体材料。经红外光谱、NMR检测证实,合成结果即为目标产物。采用热台偏光显微镜和DSC测定了材料的相变点。将其作为一种单体溶解于成品液晶,制成平行排列的液晶器件,用椭偏仪测定器件中混合液晶的Δn值后,可反推出NCS单体材料的Δn值约为0.27,这在双环液晶单体中处于较高的水平。用平行液晶器件测定了混合液晶的响应速度,发现混入NCS单体10%后器件的响应速度约有20%的提升。实验结果表明,NCS双环液晶是一种具有较高Δn、响应快速的液晶单体材料,在液晶光学调制器件中具有一定的应用前景。
英文摘要：
Three kinds of isothiocyanate （NCS） liquid crystal materials with biphenyl group were synthesized by coupling reaction, nitration, reduction reaction, etc. The final products were confirmed with IR, NMR spectra. The phase transition temperatures were measured by polarizing microscopy accompanied with a thermal stage and DSC, the results indicated that all of them did not exhibit nematic phase. The Δn of the NCS LC materials detected by ellipsometer via mixed LC materials method was about 0.27, which is higher than other liquid crystal materials with biphenyl group. The response time of the liquid crystal mixture containing NCS material was 20% faster than the original LC material when the concentration of the NCS LC material is 10%. These data indicated that the NCS materials synthesized have high birefringence and fast response properties, and would have some application potential in liquid crystal modulators.
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